Portal de Periódicos da CAPES

A QUESTÃO DA PREDOMINÂNCIA OU NÃO DE VALORES NEGATIVOS DE ASSIMETRIA DAS DISTRIBUIÇÕES GRANULOMÉTRICAS PARA OS DEPÓSITOS DA FACE DA PRAIA - UMA POLÊMICA REVISITADA

1992; Sociedade Brasileira de Geologia; Volume: 22; Issue: 1 Linguagem: Inglês

10.25249/0375-7536.1992107111

2177-4382

A.C.S.P. Bittencourt,

Coastal wetland ecosystem dynamics

BEACH FACE DEPOSITS -A REVISITEDCONTROVERS Y.Samples collected during time which are representative of depositional changes of the beach face at differentseasons were analysed.The studied beaches, Armação (Salvador-B A), Atalaia (Luis Corrcia-PI) and Caixa-Pregos (Todos os Santos Bay-B A) present distinct physiographic characteristics reflecting several energy levels.The results show that the negative skewness of grainsize distribution is not a characteristic beach face attribute.In fact, they show a dominance of symmetric distributions.It is also shown that the skewness values do not have any relation with the erosive and constructive phases of the beaches, as well as with the grain size of the beach face sediment.Itwas observed, however, that the Caixa-Pregos beach reflect the very low intensity and variability of waves that reach its beach face, throughout a very low variabil ity in the skewness values.In the Armação and Atalaia beaches, on the contrary, itwas observed that a considerable variation of skewness values reflect the greater intensity and variability of the incoming waves.